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Recently we have been hearing a really strange noise in the wall where the HVAC line sets are located. It is weird. My wife describes it as follows:

sounds like a door opening.
Then it sounds like water dripping!!
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I have heard it also. The water dripping noise is weird.
((Not water though. No water pipes in wall and no water in basement.

I do know that in summer (the old unit) I could hear noise in the wall which sounded like refrigant. Always did it until removed.

Sorry for the dumb question. Is it possible the installer
did not pull a decent vaccuum?

Perhaps the water dripping noise IS condensate dripping from the suction line which isnt insulated in a certain spot ; the suction line typically runs at 35-45 f. and must be insulated all the way, otherwise, moisture will condense and drip off the pipe. If you have metal wall studding, this would be amplified. Just a guess. Its not uncommon to hear 'swishing' noises as the refrigerant goes thru the liquid line (especially near the Cooling Coil as it enters the metering device).

Best thing is to have the Installer come by WHEN its making the noise. Give us an update when youve solved the mystery.